Rule number 6 and rule number 7:
Rule 6: When you run over someone with your bike, make sure you are not in the area where the bike will fall.
Rule 7: IF you are in the area where the bike will fall, correct your position so as to avoid it.
2 simple rules... But he wanted to laugh first!
Anyways nice flash, enjoyed it. You should make longer ones, I saw some good animation skills and humor in this one :D